Is it chemical or biological?

Patient : About 3 weeks ago I took my last birth control pill. I intend to start again but had to stop for a month because I didnt have time to refill my prescription. Since then I have had sex and have been experiencing mood swings, headaches, extreme tiredness, elevated hunger, sore lower abdomen, stuffy nose, bloody-taste in the back of my throat and my gums have been in rough shape. Is this a reaction to stopping birth control for a month or potentially something else?

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